/*
 * Copyright 2016-2019 yoara
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package yhao.infra.common.util;

/**
 * 随机数工具类
 *
 * @author yoara
 */
public class RandomUtil {
    /**
     * 生成指定位数的随机数
     * @param count 位数
     * @return
     */
    public static String makeRandomNumberString(int count){
        return makeRandomNumber(count)+"";
    }

    /**
     * 生成指定位数的随机数
     * @param count 位数
     * @return
     */
    public static int makeRandomNumber(int count){
        if(count<=0){
            throw new RuntimeException("must greater than 0");
        }
        int pow = (int)Math.pow(10,count-1);
        return ((int)((Math.random()*9+1)*pow));
    }
}
